Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..242t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 1, Sept. 1990, p. 242-249.
Astronomy and Astrophysics
Astrophysics
24
Magnetohydrodynamic Waves, Plasma Drift, Solar Radio Bursts, Solitary Waves, Plasma Density, Propagation Velocity, Solar Magnetic Field, Wave Propagation
Scientific paper
Stationary resolutions for Alfven solitons propagating obliquely in a homogeneous magnetic field are investigated. Due to their dispersive nature, kinetic Alfven waves can evolve into solitonlike structures which propagate at velocities of the order of the Alfven velocity in a direction inclined to the magnetic field. In a first model, a cold plasma with beta less than m(e)/m(i) is considered. In the second model, the plasma contains two electron components, a hot one and a cold one. Differential equations are derived for the plasma density, and examples of numerical solutions for the plasma density profiles are presented. Kinetic Alfven solitons can propagate in both cases at Mach numbers M greater than 1 or M less than 1, as rarefactions or as compressions of the plasma density. It is found that, in both models, rarefaction and compressional solitons are uniquely determined by beta and the propagation velocity vector. Interactions between the hot and cold electron components turn out to be significant for rarefactions of the cold component. Conditions are given for the existence of soliton solutions. The super-Alfven kind of solitary waves are applied to solar intermediate drift radio bursts. With a model of the emission process, they can be used to determine the magnetic field and the electron density of the source.
Benz Arnold O.
Guedel Manuel
Treumann Rudolf A.
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